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An object fired at an angle of 39 degrees above horizontal takes 1.10 s to travel the last 12.5 m of its vertical distance and the last 11.2 m of its horizontal distance. With what velocity was the
A Styrofoam cup holding 155 g of hot water at 97°C cools to room temperature, 23.0°C. What is the change in entropy of the room? Neglect the specific heat of the cup and any change in temper
A vibration platform oscillates up and down with an amplitude of 9.2 cm at a controlled variable frequency. Suppose a small rock of unknown mass is placed on the platform. At what frequency will the
A 30-turn 11.5 cm diameter coil is placed between the pole pieces of an electromagnet. When the magnet is turned on, the flux through the coil changes, inducing an emf.
The circuit is initially uncharged. It is the allowed to charge. It is then left hooked up to the battery for a long time. Then it is allowed to discharge completely. What is the value of the time c
If the heat pump is reversed so that it acts as an air conditioner in the summer, what would be its coefficient of performance?
An electromagnetic wave strikes a 2.40-cm2 section of wall perpendicularly. The rms value of the wave's magnetic field is determined to be 7.60 10-4 T. How long does it take for the wave to deliver
What is the maximum possible coefficient of performance of a heat pump that brings energy from outdoors at -13.00°C into a 22.0°C house? Note that the work done to run the heat pump is also
Why does the amplitude of the vibration of the LRC circuit change with frequency?
During each cycle, a refrigerator ejects 605 kJ of energy to a high-temperature reservoir, and takes in 545 kJ of energy from a low-temperature reservoir. (a) Determine the work done on the refriger
An isolated conductor has net charge +10*10^-6 C and a cavity with a point charge q=+3.0*10^-6 C. What is the charge on (a) the cavity wall and (b) the outer surface?
Two kids are on a merry-go-round. The boy, located 3m from the center of the merry-go-round, is feeling a centripetal acceleration of 2 m/s2. The girl 6m from the center. What is her centripetal acc
A circuit consists of a resistor in series with an inductor and an ac generator that supplies a voltage of 115 V. The inductive reactance is 58.4, and the current in the circuit is 1.03 A. Find the
A 0.344 kg mass is attached to a spring and undergoes simple harmonic motion with a period of 0.95 s. The total energy of the system is 2.8 J. Find the amplitude of the motion.
In a laboratory, a wavelength of a particular hydrogen emission line (Balmer beta line) is observed as 486.1 nm. If the same emission line appears in a star's spectrum at 486.3 nm, what is the stars
What is the frequency of the car's vibration if its mass (empty) is 1700 kg?
Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of each vehicle?
An electron moves through a uniform electric field E = (2.80i + 4.50j) V/m and a uniform magnetic field B = 0.386k T. Determine the x- and y-component of the acceleration of the electron when it has
A golf ball strikes a hard, smooth floor at an angle of ? = 32.4° and, rebounds at the same angle. The mass of the ball is 0.037 kg, and its speed is 45 m/s just before and after striking the fl
A capacitor with capacitance C = 4.10·10^-6 F is connected to an AC power source having a peak value of 6.0 V and f = 130 Hz. a) Find the reactance of the capacitor.
The springs of a 1600 kg car compress 4.0 mm when its 62 kg driver gets into the driver's seat. If the car goes over a bump, what will be the frequency of vibrations?
A sled slides along a horizontal surface on which the coefficient of kinetic friction is 0.28. Its velocity at point A is 8.0 m/s and at point B is 4.8 m/s. Use the impulse-momentum theorem to find
Dan is gliding on his skateboard at 3.0 m/s. He suddenly jumps backward off the skateboard, kicking the skateboard forward at 8.0 m/s. How fast is Dan going as his feet hit the ground? Dan's mass is
A 16 g ball of clay traveling east at 3.4 m/s collides with a 30 g ball of clay traveling north at 2.0 m/s. What are the speed and the direction of the resulting 46 g ball of clay?
Engineers have developed a bathyscaph that can reach ocean depths of 5.3 mi. If the density of seawater is about 1030 kg/m3, what is the absolute pressure at that depth? The acceleration of grav